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PDF A8697 Data sheet ( Hoja de datos )
| Número de pieza | A8697 | |
| Descripción | Wide Input Voltage 4.0 A Step Down Regulator | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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A8697
Wide Input Voltage 4.0 A Step Down Regulator
Features and Benefits
▪ 8 to 25 V input range
▪ Integrated DMOS switch
▪ Adjustable fixed off-time
▪ Adjustable output
Package: 8-Lead SOIC with exposed
thermal pad (suffix LJ)
Description
The A8697 is a constant off-time current mode step-down
regulator with a wide input voltage range. Regulation voltage is
set by external resistors, to output voltages as low as 0.8 V.
The A8697 includes an integrated power DMOS switch to
reduce the total solution footprint. It also features internal
compensation, allowing users to design stable regulators with
minimal design efforts.
The off-time can be set with an external resistor, allowing
flexibility in inductor selection. Additionally, the A8697 has
a logic level enable pin which can shut the device down and
put it into a low quiescent current mode for power sensitive
applications.
The A8697 is supplied in a low-profile 8-lead SOIC with
exposed pad (package LJ). Applications include:
▪ Applications with 8 to 25 V input
▪ Consumer electronics, networking equipment
▪ 12 V lighter-powered applications (portable DVD, etc.)
▪ Point of Sale (POS) applications
www.DataSheet4U.com
Approximate Scale 1:1
Typical Application
CBOOT
0.01 μF
VIN
+12 V
+ CIN
47 μF
25 V
BOOT
VIN
RTSET
51.1 k7
ENB
A8697
LX
TSET VBIAS
GND FB
Ratings:
L: CDRH104R-3R8
COUT: EEUFM1V151
CIN: EEVFC1H470P
L
3.8 μH
D1 R1
2 k7
R2
6.14 k7
Circuit for 12 V step down to 1.06 V at 4 A
VOUT
1.06 V/ 4.0 A
+ COUT
150 μF
56 mΩ
Efficiency versus Load Current
90
80 VOUT = 2.5 V
70
VOUT = 1.8 V
60
VOUT = 1.06 V
50
40
30
20
10
0
01234
Load Current (A)
Efficiency curve for circuit at left
A8697-DS, Rev. 2
1 page  
A8697
Wide Input Voltage 4.0 A Step Down Regulator
Start-up
Performance Characteristics
Power Off
EN; 5.00 V/div.
VOUT; 1.00 V/div.
IOUT; 2.00 A/div.
t t = 5.00 ms/div.
EN; 5.00 V/div.
VOUT; 1.00 V/div.
IOUT; 2.00 A/div.
t t = 5.00 ms/div.
Output Ripple with Electrolytic Capacitor
IOUT = 4 A
IOUT; 1.00 A/div.
VOUTAC; 100 mV/div.
Switching
IOUT = 4 A
VSW; 10.0 V/div.
IOUT; 1.00 A/div.
t t = 2.00 μs/div.
t t = 2.00 μs/div.
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
A8697
Wide Input Voltage 4.0 A Step Down Regulator
Evaluation Board Bill of Materials
Designator Quantity
Description
C1.1
0 Ceramic chip, 22 μF, 25 V, ±20%, X5R
C1.2, C1.3 2 Aluminum electrolytic capacitor, 25 V / 47 μF
C2 1 Ceramic capacitor, X7R, ±10%, 0.1 μF / 50 V
C3 1 Ceramic capacitor, X7R, ±10%, 0.01 μF / 50 V
C4.2
0 Special polymer capacitor, 120 μF / 6.3 V, 15 mΩ
C4.1
C4.3
0 Ceramic capacitor, 47 μF / 6.3 V, ±20%, X5R
1 Aluminum electrolytic capacitor, 35 V / 150 μF, 56 mΩ
L1 1 Inductor, 3.8 μH, 13 mΩ, 6 A, ±20%
D1 1 Schottky diode, 20 V / 4.0 A
Chip resistor, 1/16 W, 1%
2 kΩ at VOUT = 1.06 V
R1 1 2.55 kΩ at VOUT = 1.8 V
6.34 kΩ at VOUT = 3.3 V
10.5 kΩ at VOUT = 5.0 V
Chip resistor,1/16W, 1%
R2 1 6.14 kΩ at VOUT = 1.06 V
2 kΩ at VOUT = 1.8, 3.3, or 5.0 V
R3 1 Chip resistor, 51.1 kΩ, 1/16 W, 1%
R4 1 Chip resistor, 10 kΩ, 1/16 W, 1%
R5 1 Chip resistor, 0 Ω, 1/16 W, 1%
J1, J2, J3,
J4
4 Header, 2-pin, 100 mil spacing
P1 1 Test point, Red, 1 mm
EN 1 Test point, Black, 1 mm
U1 1 Wide Input Voltage Step Down Regulator
Manufacturer
Panasonic
Rubycon
Murata
Kemet
Panasonic
Panasonic
Panasonic
Sumida
Diodes, Inc.
Std.
Std.
Std.
Std.
Std.
Sullins
Farnell
Farnell
Allegro
Footprint
1210
8 mm × 12 mm
0603
0603
7.3 mm × 4.3 mm
× 3.1 mm
1210
8 mm × 10.2 mm
10.3 mm ×
10.5 mm × 4 mm
SMA
0603
0603
0603
0603
0603
0.100 in. × 2
0.038 in.
0.038 in.
ESOIC8
Part Number
ECJ4YB1E226M
EEVFC1H470P
GRM188R71H104KA93D
C0603C103K5RACTU
EEFUD0J121R
ECJ4YB0J476M
EEΜFM1V151
CDRH104R-3R8
SL42-9C
Std.
Std.
Std.
Std.
Std.
PTC36SAAN
240-345
240-333
A8697
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet A8697.PDF ] | |
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